<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>判断给定文件名是否是一个目录</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.is-dir" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">is_dir</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">is_dir</span> &mdash; <span class="dc-title">判断给定文件名是否是一个目录</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.is-dir-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>is_dir</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   判断给定文件名是否是一个目录。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.is-dir-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">filename</code></dt>

     <dd>

      <p class="para">
      如果文件名存在并且为目录则返回 <strong><code>TRUE</code></strong>。如果 <code class="parameter">filename</code> 是一个相对路径，则按照当前工作目录检查其相对路径。
       If <code class="parameter">filename</code> is a symbolic or hard link 
       then the link will be resolved and checked. If you have enabled <a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">安全模式</a>,
       or <a href="ini.core.html#ini.open-basedir" class="link">open_basedir</a> further
       restrictions may apply.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.is-dir-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果文件名存在，并且是个目录，返回 <strong><code>TRUE</code></strong>，否则返回<strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.is-dir-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2812">
    <p><strong>Example #1 <span class="function"><strong>is_dir()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_dir</span><span style="color: #007700">(</span><span style="color: #DD0000">'a_file.txt'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_dir</span><span style="color: #007700">(</span><span style="color: #DD0000">'bogus_dir/abc'</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">is_dir</span><span style="color: #007700">(</span><span style="color: #DD0000">'..'</span><span style="color: #007700">));&nbsp;</span><span style="color: #FF8000">//one&nbsp;dir&nbsp;up<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
bool(false)
bool(false)
bool(true)
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-function.is-dir-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
失败时抛出<strong><code>E_WARNING</code></strong>警告。
</p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.is-dir-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数的结果会被缓存。参见
<span class="function"><a href="clearstatcache.html" class="function">clearstatcache()</a></span> 以获得更多细节。</span></p></blockquote>
  <div class="tip"><strong class="tip">Tip</strong><p class="simpara">自 PHP 5.0.0 起, 此函数也用于<em class="emphasis">某些</em>
URL 包装器。请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>以获得支持 <span class="function"><a href="stat.html" class="function">stat()</a></span> 系列函数功能的包装器列表。</p></div>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.is-dir-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="chdir.html" class="function" rel="rdfs-seeAlso">chdir()</a> - 改变目录</span></li>
    <li class="member"><span class="function"><a href="dir.html" class="function" rel="rdfs-seeAlso">dir()</a> - 返回一个 Directory 类实例</span></li>
    <li class="member"><span class="function"><a href="opendir.html" class="function" rel="rdfs-seeAlso">opendir()</a> - 打开目录句柄</span></li>
    <li class="member"><span class="function"><a href="is_file.html" class="function" rel="rdfs-seeAlso">is_file()</a> - 判断给定文件名是否为一个正常的文件</span></li>
    <li class="member"><span class="function"><a href="is_link.html" class="function" rel="rdfs-seeAlso">is_link()</a> - 判断给定文件名是否为一个符号连接</span></li>
   </ul>
  </p>
 </div>

</div></div></div></body></html>